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GB/T 50761-2018 English PDF (GBT50761-2018)

GB/T 50761-2018 English PDF (GBT50761-2018)

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GB/T 50761-2018: Standard for seismic design of petrochemical steel equipment
GB/T 50761-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 50761-2018
Standard for seismic design of
petrochemical steel equipment
ISSUED ON. JANUARY 16, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword ... 6 
1 General provisions ... 8 
2 Terms and symbols ... 9 
2.1 Terms ... 9 
2.2 Symbols ... 10 
3 Basic requirements ... 13 
3.1 Classification of importance factors ... 13 
3.2 Seismic influences ... 13 
3.3 Equipment system design ... 14 
4 Seismic action and seismic checking ... 16 
4.1 General requirements ... 16 
4.2 Seismic design response spectral of above-ground equipment ... 17 
4.3 Horizontal seismic action of above-ground equipment ... 19 
4.4 Horizontal seismic action of on-framework equipment ... 22 
4.5 Vertical seismic action ... 23 
4.6 Combination of loads ... 24 
4.7 Seismic checking ... 25 
5 Horizontal vessels ... 29 
5.1 General requirements ... 29 
5.2 Seismic action and seismic checking ... 29 
5.3 Details of seismic design ... 30 
6 Vertical vessels supported by legs ... 31 
6.1 General requirements ... 31 
6.2 Natural vibration period ... 31 
6.3 Seismic action and seismic checking ... 33 
6.4 Details of seismic design ... 33 
7 Vertical vessels supported by lugs ... 34 
7.1 General requirements ... 34 
7.2 Natural vibration period ... 34 
7.3 Seismic action and seismic checking ... 35 
7.4 Details of seismic design ... 35 
8 Vertical vessels supported by skirt ... 36 
8.1 General requirements ... 36 
8.2 Natural vibration period ... 36 
8.3 Seismic action and seismic checking ... 38 
8.4 Details of seismic design ... 39 
9 Spherical tanks supported by legs ... 41 
9.1 General requirements ... 41 
9.2 Natural vibration period ... 41 
9.3 Seismic action and seismic checking ... 44 
9.4 Details of seismic design ... 45 
10 Vertical cylindrical storage tanks ... 46 
10.1 General requirements ... 46 
10.2 Natural vibration period ... 46 
10.3 Horizontal seismic action and seismic effect ... 47 
10.4 Allowable compression longitudinal stresses of tank shell ... 49 
10.5 Seismic checking of tank shell ... 49 
10.6 Liquid sloshing height ... 52 
10.7 Details of seismic design ... 53 
11 Tubular heater ... 54 
11.1 General requirements ... 54 
11.2 Natural vibration period ... 54 
11.3 Seismic action and seismic checking ... 60 
11.4 Details of seismic design ... 62 
Appendix A Horizontal seismic action of on-framework equipment ... 66 
Appendix B Seismic checking of vertical vessels supported by legs ... 69 
Appendix C Seismic checking of vertical vessels supported by lugs ... 75 
Appendix D Calculation of flexible matrix element ... 79 
Explanation of wording in this standard ... 83 
List of quoted standards ... 84 
Standard for seismic design of petrochemical steel
equipment
1 General provisions
1.0.1 In order to implement the national laws and regulations on earthquake
prevention and disaster reduction, implement a prevention-oriented policy,
mitigate the seismic damage by seismic-fortifying the petrochemical equipment,
reduce economic loss, this standard is hereby formulated.
1.0.2 This standard is applicable to the seismic design of the petrochemical
horizontal vessel, vertical vessels supported by legs, vertical vessels supported
by lugs, vertical vessels supported by skirt, spherical tanks supported by legs,
vertical cylindrical storage tanks, tubular heater, other steel equipment which
are used in the area where the basic seismic acceleration not exceeding 0.40
g or seismic fortification intensity of 9 degrees or less.
1.0.3 For the petrochemical equipment which is subjected to the seismic design
according to this standard, when it is impacted by the fortification earthquakes
equivalent to the seismic fortification intensity of the area, the body, bracing
member, anchoring structure shall not be damaged.
1.0.4 The design parameters of ground motion or the seismic fortification
intensity shall be determined in accordance with the relevant provisions of the
current national standard “Seismic ground motion parameter zonation map of
China” GB 18306. For the construction site where the seismic safety evaluation
is completed, it shall carry out the seismic fortification according to the approved
design parameters of ground motion or the seismic fortification intensity.
1.0.5 The seismic design of petrochemical steel equipment shall, in addition to
complying with this standard, also comply with the relevant current national
standards.
2 Terms and symbols
2.1 Terms
2.1.1 Seismic design
A specialized design for equipment that requires seismic fortification, including
seismic calculations and seismic measures.
2.1.2 Seismic fortification intensity
The seismic intensity which is approved according to the authority as specified
by the state as a basis for seismic fortification of a region.
2.1.3 Seismic action
The dynamic effects of equipment caused by ground motion, including
horizontal seismic action and vertical seismic action.
2.1.4 Seismic effect
Internal forces or deformations generated by the equipment under seismic
action.
2.1.5 Design parameters of ground motion
The time-history curve of acceleration of ground motion, the response spectrum
of acceleration, the peak acceleration which are used for seismic design.
2.1.6 Design basic acceleration of ground motion
The design value of the acceleration of ground motion which exceeds the
probability of 10% in the 50-year design base period.
2.1.7 Characteristic period of ground motion
In the seismic influence factor curve for seismic design, the period value
corresponding to the starting point of the falling segment which reflects the
factors such as seismic magnitude, epicentral distance, site category, and other
factors.
2.1.8 Seismic influence factor
The statistical mean of the ratio of the maximum acceleration response to the
gravitational acceleration of a single-mass point elastic system under seismic
action.
meq - The equivalent total mass of equipment;
mi, mj - Respectively, the masses concentrated on the particles i, j;
meqv - The vertical equivalent mass of equipment;
mi - The mass concentrated at the particle i;
mj - The mass concentrated at the particle j;
Sj - The effect produced by the horizontal seismic action of the vibration-
mode j;
Sh - Horizontal seismic effect;
Xji - The horizontal relative displacement of the particle i of the jth vibration-
mode.
2.2.2 Performance and resistance of materials.
Et - The modulus of elasticity of the material at the design temperature;
Rel - The yield strength of material;
σ - The stress value under the action of load combination;
[σ] - The allowable seismic stress of the material;
[σ]t - The allowable stress of the material at the design temperature;
[σ]b - The allowable seismic tensile stress of the material;
[σ]bc - The allowable seismic compressive stress of the material;
τ - The value of the shear stress under the action of load combination;
[τ] - The allowable seismic shear stress of the material;
[τ]b - The allowable seismic shear stress of the material.
2.2.3 Calculation coefficient.
α1 - The ho...
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